EP0460818A2 - Method for preventing the oscillation of an RF power module - Google Patents

Method for preventing the oscillation of an RF power module Download PDF

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Publication number
EP0460818A2
EP0460818A2 EP91304404A EP91304404A EP0460818A2 EP 0460818 A2 EP0460818 A2 EP 0460818A2 EP 91304404 A EP91304404 A EP 91304404A EP 91304404 A EP91304404 A EP 91304404A EP 0460818 A2 EP0460818 A2 EP 0460818A2
Authority
EP
European Patent Office
Prior art keywords
module
control
input
power module
oscillation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91304404A
Other languages
German (de)
French (fr)
Other versions
EP0460818A3 (en
Inventor
Jukka Vesterinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heikki Marttila Oy
Original Assignee
Heikki Marttila Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heikki Marttila Oy filed Critical Heikki Marttila Oy
Publication of EP0460818A2 publication Critical patent/EP0460818A2/en
Publication of EP0460818A3 publication Critical patent/EP0460818A3/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers

Definitions

  • the invention relates to a method and a circuit arrangement for preventing the oscillation of a high frequency power module, specially relating to radiotelephone sets.
  • a transmitting circuit can use an integrated radio frequency (RF) power amplifier module, which operates for example on a wideband basis on HF, VHF or UHF ranges.
  • RF radio frequency
  • Such a power module is controlled by an input signal, i.e. a power adjusting control, when the set is in an active transmitting state. Control is not being fed to the power module while it is in a stand-by state, i.e. the module is in an uncontrolled state. In this case the module may start to oscillate. The potential oscillation has to be prevented because of the problems caused by oscillation.
  • the object of the invention is to provide a simple and advantageous method for preventing the oscillation of a radio frequency power module when the input signal, i.e. the control is removed therefrom.
  • Fig. 1 shows diagrammatically the method according to the invention implemented by the circuit arrangement
  • Fig. 2 shows a more detailed implementation of the circuit arrangement illustrated in Fig. 1.
  • a radio frequency power module IC1 is illustrated in Fig. 1.
  • the supply voltage is VS
  • the input signal i.e. the power adjusting control is indicated by IN
  • a coupling element Q7 preferably a bipolar transistor, which is made conductive when the input signal IN is removed, is installed between the input and the ground.
  • the transistor Q7 is made unconductive when the input signal is active.
  • the coupling element Q7 can be chosen as a much more advantageous low-power component than the power switch which can be used to control the supply voltage.
  • FIG. 2 A more detailed circuit arrangement is illustrated in Fig. 2, where the power module IC1 is of type BGY45A with a frequency range between 68...88 MHz, a supply voltage of 10...15 V and a nominal output power of 29 W.
  • the input is controlled by power level of 10...150 mW.
  • the transistor Q1 in Fig. 2 operates as a power control unit. By adjusting its operating voltage the RF input signal coming to the power module IC1 is changed.

Abstract

The invention relates to a method and a circuit arrangement for preventing the oscillation of a radio frequency power module (IC1). According to the method of the invention a coupling element (Q7), preferably a bipolar transistor, which is made conductive when the input signal (IN) is removed, is installed between the input (IN) and the ground. The supply voltage (VS) in the power module can be permanently switched on.

Description

  • The invention relates to a method and a circuit arrangement for preventing the oscillation of a high frequency power module, specially relating to radiotelephone sets.
  • In radiotelephone transmitter sets, e.g. in portable or mobile telecommunications equipment, a transmitting circuit can use an integrated radio frequency (RF) power amplifier module, which operates for example on a wideband basis on HF, VHF or UHF ranges.
  • The operation of such a power module is controlled by an input signal, i.e. a power adjusting control, when the set is in an active transmitting state. Control is not being fed to the power module while it is in a stand-by state, i.e. the module is in an uncontrolled state. In this case the module may start to oscillate. The potential oscillation has to be prevented because of the problems caused by oscillation.
  • In the conventional method the supply voltage of the power module has been under control, i.e. the supply voltage has been disconnected when the control has been removed from the module. Such operation requires, however, switching off high current and accordingly providing costly switching components, which are high current resistant.
  • The object of the invention is to provide a simple and advantageous method for preventing the oscillation of a radio frequency power module when the input signal, i.e. the control is removed therefrom.
  • This purpose is achieved according to the invention by the method according to the features of Claim number 1. The method according to the invention can be implemented in a simple manner and using advantageous components. Furthermore, according to the invention, the supply voltage in the power module can be permanently switched on.
  • Other preferred embodiments of the invention are described in the dependent claims.
  • The invention is described in the following by an exemplary embodiment with reference to the accompanying drawing, in which Fig. 1 shows diagrammatically the method according to the invention implemented by the circuit arrangement, and Fig. 2 shows a more detailed implementation of the circuit arrangement illustrated in Fig. 1.
  • A radio frequency power module IC1 is illustrated in Fig. 1. The supply voltage is VS, the input signal, i.e. the power adjusting control is indicated by IN, and the amplified output of the power signal generated by the power module, respectively, is indicated by OUT. According to the method of the invention a coupling element Q7, preferably a bipolar transistor, which is made conductive when the input signal IN is removed, is installed between the input and the ground. The transistor Q7 is made unconductive when the input signal is active. Since the power levels used in the input are in the range of 1/1000 of the power level of the output and of the input power VS, respectively, it is clear that the coupling element Q7 can be chosen as a much more advantageous low-power component than the power switch which can be used to control the supply voltage.
  • A more detailed circuit arrangement is illustrated in Fig. 2, where the power module IC1 is of type BGY45A with a frequency range between 68...88 MHz, a supply voltage of 10...15 V and a nominal output power of 29 W. The input is controlled by power level of 10...150 mW. The manufacturer of this circuit discloses that the power module should be stable i.e. non-oscillating also without control, i.e. when the input power = 0,0 mW. Practise has proven, however, that oscillation occurs, which can be prevented according to the invention by the arrangement of the input with the bipolar transistor Q7.
  • The transistor Q1 in Fig. 2 operates as a power control unit. By adjusting its operating voltage the RF input signal coming to the power module IC1 is changed. When the module is not controlled, i.e. the control signal TX of Q1 = off, Q7 is placed into a conductive state by connecting e.g. a voltage of +5 V via resistor R34 into its base (TM=on). When the module is given control power (TX=on), Q7 is made unconductive by connecting a voltage of 0 V via R34 to its base (TM=off).
  • Preferably a logical circuit (not shown) is arranged to control the control signals TX and TM so that TM is a logical negation of signal TX (TM = TX).

Claims (6)

  1. A method for preventing the oscillation of an RF power module, characterized in that the input (IN) of the module (IC1) is connected (Q7) to the ground, when the control is switched off, and that the ground connection is switched off when the control is switched on.
  2. A method according to Claim 1, characterized in that the operating voltage (VS) of the module (IC1) is permanently connected during operation.
  3. A method according to the preceding Claims, characterized in that the control (TX) of the input of the module (IC1) and the ground connection is controlled (TM) essentially simultaneously by a common circuit.
  4. A circuit arrangement for preventing the oscillation of an RF power module when the operating voltage of the module is permanently connected during operation, characterized in that it comprises a coupling element (Q7) connected to (IC1) the input, with the coupling element, owing to a signal (TM) in its control input, grounding the input of the module when the control (TX) of the module is switched off, and switches the ground connection off when the control of the module is switched on.
  5. A circuit arrangement according to Claim 4, characterized in that the signal (TM) of the control input of the coupling element (Q7) and the control (TX) of the module (IC1) are formed via a common circuit, whereby the signal of the control input of the coupling element is essentially a logical negation of the control signal of the module (TM = TX).
  6. A circuit arrangement according to Claim 4 or 5, characterized in that the coupling element (Q7) is a low-power transistor.
EP19910304404 1990-06-05 1991-05-16 Method for preventing the oscillation of an rf power module Withdrawn EP0460818A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI902812 1990-06-05
FI902812A FI85546C (en) 1990-06-05 1990-06-05 Procedure for preventing oscillation in an RF power module

Publications (2)

Publication Number Publication Date
EP0460818A2 true EP0460818A2 (en) 1991-12-11
EP0460818A3 EP0460818A3 (en) 1992-09-02

Family

ID=8530571

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910304404 Withdrawn EP0460818A3 (en) 1990-06-05 1991-05-16 Method for preventing the oscillation of an rf power module

Country Status (2)

Country Link
EP (1) EP0460818A3 (en)
FI (1) FI85546C (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216432A (en) * 1977-09-08 1980-08-05 General Research Of Electronics, Inc. Automatic switching system for a combination transceiver-auxilliary receiver radio
US4417165A (en) * 1979-03-26 1983-11-22 Olympus Optical Co., Ltd. Muting circuit
EP0246640A2 (en) * 1986-05-23 1987-11-25 Ball Corporation Transmit/receive module for phased array antenna system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216432A (en) * 1977-09-08 1980-08-05 General Research Of Electronics, Inc. Automatic switching system for a combination transceiver-auxilliary receiver radio
US4417165A (en) * 1979-03-26 1983-11-22 Olympus Optical Co., Ltd. Muting circuit
EP0246640A2 (en) * 1986-05-23 1987-11-25 Ball Corporation Transmit/receive module for phased array antenna system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH, SECTION vol. 169, no. 3, March 1980, AMSTERDAM pages 601 - 604; MURPHY ET AL.: 'The use of inexpensive transceivers for time coincidence experimentes with baseline up to 10 kilometers.' *

Also Published As

Publication number Publication date
FI85546C (en) 1992-04-27
FI85546B (en) 1992-01-15
FI902812A (en) 1991-12-06
FI902812A0 (en) 1990-06-05
EP0460818A3 (en) 1992-09-02

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